Superheater



IH. R. STEVENS ET AL SUPERHEATER me@ Dec', 7. 1923 3 sheets-sheet T E Fum E T y a .wp 55. R m @u AT L ai HW n D 5 m T ank M.. up@

Fatented dept, d,

HARRY R. STEVENS, WILLAM SVPARKER, FRANK VT. SHLEJERT, AND JARED C.BENSUN, F SANFORD, FLORIDA.

SUPERHEATER.

Application filed December 7, 1923. Serial No. 6'29,159.

f This invention relates to improvements in super-heaters. l

`The primary object of this invention is the provision of a superheaterunit of the type adapted for use in the flue tubes of boilers or thelike, so that the heated from the boilermay be used for heatingsaturated steam which flows into the superheater unit for the purpose ofdrying and Superheating the saine.

A, further object of this invention is the provision of a novel type ofsuper-heater embodying` a construction which will permit of the facileassemblege of the unit in a flue or other nieinber of lilte' character,and so that the heated gases may always be insured of a free flow aboutthe superlneater for heating` a maximum surface thereof.

further object of this invention is the provision. of a superheater unitof the above mentioned cl'laracter embodyingl a systeinfor theconduction of saturated steam therethrough for superheating1 purposes,operating' in an efficient manner to perform the purpose for which it isadaiited.

A. further object of this invention is the provision of av superheaterunit for heating lines and the like of steainlocomoti ve or stationaryboilers designed so that the same is accessible at all times forcleaning` purposes, and prefe-xrably being' ofa cha acter to render the.same interchangeable with the Schmidt type of superheater, altl'ioupghoperating on an improved principle overcoming many defects which arewell known with this type of superheater.

Other objects and advantages of this in vention `will be apparent duringthe course of the following detailed descrii ation.

ln the accompanying drawings. forming` a partof this specification, andwherein siinilar reference characters designate corresponding partsthroughout the several views.

Figure l is a longitudinal cross sectional view taken throughthepreferred type of super-heater unit, showing `the saine in its assembledrelation within the flue of a boiler or the like.

Fig. 2 is a cross sectional view taken substantially on the line Qf-2 ofFigure l.

Fig 3 is a longitudinal cross sectional view taken through the improvedsuperheater unit substantially on the line 3 3 of Figure 4. Y

Fig: l is an end elevation, partly in cross section,` of the in'iprovedsuperheater unit.

Fig. 5 is a longitudinal cross sectional view through a inodiiied fornoof superheater unit embodying' the essential principles of the unitIillustrated in Figures l to l inclusive. although constructed after adifferent method than the saine.

Fir. (i is a cross sectional View taken substantially on the line G-6 ofFigure 5.

Fig. 7 is a cross sectional view taken through the improved superheaterunit substantially on the line 7--7 of Figure 5.

Fig. 8 is a front elevation, partly in seetion et' the improvedsuperheater unit illustrated in F igure 5.

Fig. 9 is a longitudinal cross sectional view taken through the improvedsuperh-eater unit substantially on the line 9-9 of Figure S. i

Fig. l() is longitudinal cross sectional view taken through a furtherform of superheater.

Fier.

ll is a plan view of the superheater shown in Figure l0.

F l2 is an end View of the superheatcr sl'lown in Figure l1.

Figs. 13 and let are cross sectional views (alten, on their respectivelines in Figure il of the drawings.

ln the drawings, wherein for the purpose oin illustration are shown theforms of the in'iproved superlieater unit and the manner in which theyare used in connection with a heating` flue or tube, the letter A maygenerally designate the heating flue or tube, which may be a part of aboiler, and within which the improved types of superheater units il, Cor l) maybe used.

Referring' to the heater flue construction A, the saine is preferablysupported at its front end in the front wall 10 of a boiler, having' theoutwardly extending` flange ll which overlies the front surface of theplate l0. The flue A for the major length of the body portion 12 thereofis of uniform diameter, providing a passageway 13a there through. .slt adistance from the plate 10 the tube It converges in diminishingrelation` as at 13, to restrict the passageway through the I'lue A.

Referring" `to the superl'ieater unit B, the sainepreferably comprisesan inner substantially `cylindrical shaped member 20, which is of theuniform diameter from end to end, and irovides a passageway 2ltherethrough.

v0n diametrically.opposed vsides ot' the cylindrical .shaped casing ormeniber 20 flanges 22 and 23 are welded, or otherwise secured thereto;these flanges 22 and 23being 1n the lnatinevot'partition walls, as will`be sub- Vportion 28.

The v`tubular lmember 2O lis connected in concentric .relation withinthe tubular member'25; the member 2O at its front end being Vwelded,Vas-at 29, vto the forward end of the tapered portion 28. The partitionwalls or flanges -22 and 23 extend respectively in therslots 2G and .27of the member'25 and are suitablyr welded therein, `substantially asisillustrated in 'the drawings, so that they entirely ill said'slOtS. Afront wall 31, of substantially ring :shaped formation is welded to therear edges oli thev cylindrical shaped .inner and outer members 2O and25 respectively, to enclose the `compartment defined by the spacebetween the inner and outer members 20 and 25. This compartment or spacebetween the tubular members` 20 .and 25 is sub-divided by the partitionwalls 22 and 23 intocompartments 35 and 36 which are in Arelative.communication at the rear endet theunit B, through the passageways 37.The pasageways 37 are formed by reason-oit the termination of thepartition walls 22 and`-23 short ofthe tapered portion 28 ofthe tubularvmember 25.V At the front endofthe units B interiorly screw threadedextensions 39 and 40 are integrally provided with ithelcylindricalshaped portion 25, which Y respectively provide .inlet and outletopeningslt'l and 42 for the compartments 35 and Referring to theassemblage of the unit B Vwithin the flue A, supporting legs 45, of

substantially iI-'shaped formation are radially positioned. vin thepassageway 113 ot the `flue A, andare welded to the portion 25 of thesuperheater unit B, `to support the superheater unit B 'in an eccentricrelation within the passageway 18a of. vthe heater flue A.lVhiletheaxesof the super-heater unit B and ,theilue A are parallel, yetthe supporting is illustrated lin YFigure 2 of the 'dra-wings. Thisarrangement of `the sulvierheater unit B. in the lue A permits of somesettlement of soot and foreign material in the lower portion of thepassageway 13, without inipeding *the 'clratft or the effective playingof vhealed.gases over the ent-ire exposure of the superl'ieater unit B.'lvhe legs 45 are also so positioned that :the tapered end 28 ol theunit B is disposed in proximity to the tapered portion 13 :of the llueA, for the ellicient guiding of exhaust gases over the exposed surfacesof the superheater unit B. At its front -end the 'superheater unit 'Bextends suiliciently out. of the -llue passageway 13, that theinle't/a-ndoutlet openings 41 and 42 may suitably receive therein partsof couplings by means of which saturated steam may be vled Einto thesuperhcater and the snperheated steam led therefrom.

lcferring to the operation of this invention the saturated or wet steamenters the snperheater compartment 35 through the inletfolpening l1, andpasses longitudinally of this compartment '35 towardthe rear end of thesuperheater unit B. Thus, the saturated steam vtravels against the flowof the exhaust which as is well understood are heated. and low in thespace between the outer casi-ng` portion 25 of the snperheater unit B,and the walls of the flue A. The suturated steam `is dried as itadvances toward the rear of the unit B, and through the passageway 37enters the compartment 3G and is directed from the rear toward thefrontof the compartn'ient B and lexits through the opening L12 ol theunit B `|in a superheated condition. The vheated gases which flowthrough the flue A, ofcourse, are -given an easy pitch =by-reason oft-he tapered portion 2S ot the unit Br` which enters the tapered portionv1S oft said l'lue fr; the heated fr flowingv in the flue A., of course`passing through the passageway 21 of the inner ensing 20 ol the-unit B,as well as .passing around and in the space between unit B yand the flueA.

Referring to the construction of the superheater .unit C, the same isconnected in the flue A `in the same manner as the unit B abovedescribed. and this unit also embodies the fundamental features oil theunit B. It preferably comprises an inner casing construction 50, which`is formed of two elongated sections "51 iand 52, each comprising asemi-circular portion 53 with the diametrically opposed and outstandingyflanges 54 at. the longitudinal. edges thereof. These flanges 54 extendfrom the extreme front edge or' the sections 51 and I52, but terminateshort of the opposite ends of said sections. An outer casing 55 ispreferably provided. having the longitudinally extending slots 56 and 57in diametrieally opposedrelation therein, which extend ifrom `the frontedge lll() ien 'rees rse ol thecasing or cylindrical portion 55,although they terminate short ot' the opposite end of said casing 55.rlhe casing or member 55 at its rear end tapers in diminishingdiameter,' to provide a portion l59substantially identical `with theportion 28 oitthe unit B above described.

i rilhe inner casing construction is, 'ot course, Aassembled `Within theouter casingl construction 55, and to this end the flanges 54: of thesections 51 and 52 are' placed in abutting relationl and are Welded inthe slots 56 and 57 ot the outer casing or member 55, to entirely sealsaid slots, and to subdivide the interior of the outer casinglvbetvver-in the inner casing and the same into compartments 60 and A6.1,which have coniinunication at the rear end ot the unit C through. thepassageivays 68; these passageways 63 interccnnnunicating saidcompartment, by reason ot the tact that the flanges 54e do not extend.tor the entire length ot the casing `55, and therefore do not partitionsaid compartments 'from each other. AV `:front wall 65 ot' substantiallyring shaped formation is Welded. to the front edges ot the casingportions or members 50 and 55, to sealthe compartments at the front endot the unit C, and at its rear end the tapered portion 59 is Welded tothe rear end ot the casing sections 51'and 52. vThe compartments 60 and(31 at the forward end ol the unit C are respectivelyV provided with theinlet and outlet openings (SG and- GT, which are 'formed throughsuitable upwardly extending tubular extensionsti) and respectively,vsubstantially `as Vprovided 'for the unit B above described.

ylhe unit C is assembled Within the tine A enact-ly as described for thepreferred embodiment of thisinvention, and the operation ot the steamtheretluough 'for the purpose o'tsuperheating identically as abovedescribed tor the superheater 'unit B.

Referring to` the 'form ot superheater l), the same is probably the mosteconomical and practical form otl superheater. The superheater comprisesthe elongated hollow sections 8O and 81, which are ott identical'formation and preferably substantially crescent shaped in cross sectionand respectively providing the longpritudinallv extending compartments88 and 84: therealong` which in cross section are also crescent shaped.These sections 8O and 81 are pressed into their crescent sha-pe fromtubularstock material, and at their flue inserting ends are eachprovided with elongated openings 85 and 86 in the upper and lowerlongitudinal edges thereof. The sections and 81 at their flue inserting`ends are drawn into a leak proof joint, With a tapered end 88 Which liesWithin the area delined by the tapered portion 13 of the lue A vvhen thesuperheater is in place.` The sections 80 on to seal the compartments 83and 841-. let and outlet extensions 97 and 98 are proand 81 are placedtogether with their concave sidesfacing each other, and are welded atpoints 9() along their upper and lower marginal edges, to securelyconnect said sections 80 and 81 into a superheater which is circular `incross section and Which provides the longitudinally extending gaspassageway 92 therethrough open at both the superheater passageway 92,orvice versa,

and thus providing an increased heating surface on the superheater` unitD. Of course, the slots or openings 85 on the upper edges `et thesections 80 and 81 are placed in abutting connnunicating relation, asare also the slots v8G in the lower edges o'l said sections. lThesections 8O and 81 are then welded at n about the slots or openings 85and 86 in a steam tight "Weld, so that the compartments 83 and 84upwardly comniunicate with each other through the alignin e' passageways85-,and belouT the compartments conn'nunicate with each other throughthe aligning passageways 86. At the outer ends ot the se'tions 80 and81, closure caps 05 may be welded or otherwisesecured therellnvidedonthe sections 8O and 81 respectively, which respectively provideinletand outlet openings 99 and 100 tor the superheater unit Thesuperheatcr unit D has the diagonal supporting legs 101 Welded thereonin the manner above described lor the other forms ot tl invention, sothat when the superheater unit l) is placed in theA flue Ait Will beeccentrically disposed therein to provide a greater area ot thepassageway 13 below said superheater unit D than is provided between thetop of said superheater and the top of thetlue A, and for a purposewhich has been subsequently described. The steam is of course guidedinto the inlet `opening and from thence flows longitudinally through thecompartment 83 toward the inner passageway of the liuc A and the Wetsteam is gradually dried during such passage. rlhe steam then passesfrom the compartment 83 into the compartment 84 through the passagewavs85 and 86, and the steam is superheated during its passage in thecompartment 84 toward the outlet opening 100. This form of inventionprovides a ,very durable and economical superheater vvhich does awayWith much ot the Welding necessary for the other forms of invention.

From the foregoing description of this invention it is apparent that asuperheater has been provided Which may be convenlll() ,iently attachedin an ordinary flue of a boiler,v so that the heated gases flowingthereinmay be taken advantage of for the purpose Yof superheatingsaturated steam. The device is` accessible so that soot, dirt, and otherforeion materials may be readily reached'and cleaned therefrom, and thefact that soot.v does settle iii the lues of the pipe is Welllrecognized, and the construction of this invention has taken care ofthis feature vsovthat the lsettlementof soot oi' foreign inaterialsinthe flue will not` in any way obstruct the How of theheated gasesabout the superheatei. for the purpose of heating the maximum surfacethereof.y Therefore, the degree of heating of the steam within theSuperheater can be accurately determined andrelied upon, The device isinexpensive and..` the maintenance expense in connection therewith isnegligible vin contradistinction to the maintenance expense of ordinarysuperheat'ers which are inaccessible in the majority of instances.

Various changes in the shape, size, and arrangement of parts may be,made tothe form ofthe'invention herein shown and described, withoutcl'eiiarting from the spirit of this. inventionfor the scope of theclaims.

I/Ve claim: i

I. As. an article of manufacture a superheater unit comprising an' innercylindrical shaped` casing, an outer cylindrical. shaped casing havingslots at diainetrica'lly opposed points thereon extending from oney endV.toward the,y other end. for the .major length thereof, partition wallswelded to said inner casingon the outer circumference thereof and Weldedin the slots of said outer casing,and means sealing thev inner and outercasingsv at. the` ends thereof, said outer casing Ahaving'iniet andoutlet openings comrnunicatingwith the=space between.. the inner and.vouter casings. n e

.2. VIn a superheater the combination of an inner-"tubularcasingstraight throughout the length, an outer tubular ycasing of greaterteams@ diameter than the inn-er casing, means connecting said casings ina sealed relation at their ends, the outer casing at onel endbeing'tapered over a considerable length from intermediate its ends inconverging relation to a sealed connection with the end of inner casing,s aid inner casing having a straight passageway therethrough ofsubstantially uniform diameter from end to end, partition means in thespace between the casings subdividing said space into compartmentshaving communication with each other directly in the tapered endof theouter casing, and inlet and outlet port means for, said compartments,

3. In a superheateil construction the conibination with a heating flue,of a single cvlindrical shaped superlieater unit in said heating iiueeccentrically supported therein and including outer and inner tubularcasings in spaced relation to provide a steam compartment, the tubularcasings heilig sealed at opposite ends and the inner casing having apassageway longitudinally therethrough open in longitudinally aligningrelation with the flue for passage of heated gases therethrough, theouter tubular casing being tapered in a converging relation at one endto constrict the steam compartment between said casings,I the saidtapered end facing countereurrent to heated gas travel through the flue,and partition means in the space between said casings subdivid ing thesaine into compartments which have inter-communication at the taperedend ot the outer casing ofv said superheater unit. the flue having apassageway constricting portion therein into which the tapered outercasing end of the superheater directly extends to cause deflect-ion ofthe heated gases externally of the superheater unit and through thepassageway ofthe inner casing.

HARRY R. STEVENS. WILLIAM S. PARKER. FRANK IV. SHUPERT. JARED C. BENSON.

